Stir 1/2 cup salsa, chicken, pepper and avocado in large bowl. Stir remaining salsa and sour cream in small bowl.

Spread 1/4 cup sour cream mixture onto each tortilla. Top each with 1 cup chicken mixture and 1/2 cup lettuce. Fold sides of tortillas over filling and then fold up ends to enclose filling. Cut each wrap in half before serving.